authoring-java-sdk-tasks
Writes Airflow task logic in Java, Kotlin, or any JVM language using the Airflow Java SDK. Use when the user wants to implement Airflow tasks in Java/JVM, asks about `@Builder.Dag`/`@Builder.Task`/`@Builder.XCom`, the `Task`/`BundleBuilder` interfaces, reading connections/variables/XComs from Java, the JSON-to-Java type mapping, or logging from Java tasks. This skill covers the Java-specific native API; the shared Python-stub pattern and conceptual model live in authoring-language-sdk-tasks. For building/shipping the bundle see deploying-java-sdk-bundles; for coordinator config see configuring-airflow-language-sdks.
Install
With your agent
Install OMGSkills skill "astronomer/agents:skills/authoring-java-sdk-tasks" into this agent's normal skills directory: call the OMGSkills MCP get_install_plan tool for your agent and run the script it returns (it installs only the pinned commit and verifies SKILL.md), and stop if MCP or the pin is unavailable. Do not overwrite or change existing skills without asking me.
Manual command
git clone https://github.com/astronomer/agents /tmp/agents && ln -s /tmp/agents/skills/authoring-java-sdk-tasks ~/.claude/skills/authoring-java-sdk-tasksFrom README
Authoring Java SDK Tasks The Airflow Java SDK implements the language-SDK model for the JVM: your DAG stays in Python, and each task instance runs in a short-lived JVM subprocess. This skill covers the Java-specific native API. The shared model — the Python @task.stub pattern, ID matching, and the XCom-as-JSON contract — lives in authoring-language-sdk-tasks; read that first if you're new to language SDKs. Experimental. The Java SDK is in preview. Artifact coordinates and APIs may change. Related skills: authoring-language-sdk-tasks (shared Python stub + concepts), configuring-airflow-language-sdks (route the queue to JavaCoordinator), deploying-java-sdk-bundles (compile and ship the JAR). --- Recap: the Python side Java tasks are paired with Python stubs that carry no logic — they declare the task, queue, dependency graph, and retries. IDs must match the Java annotations exactly, and an upstream argument on a stub only declares the dependency (the value is fetched in Java).
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